MoO3 and KSCN were taken as precursors to synthesize spherical flower-like MoS2 through the hydrothermal method， where MoO3 worked as the source of molybdenum for the reaction， and KSCN provided sulfur， KSCN also worked as the reducing agent of this reaction. With the method of controlling the reaction temperature， changing pH， adding a surfactant， and a large excess of sulfur source in the reagent， many experiments were explored to discover the effects of different experiment parameters on the crystal structure and morphology of MoS2. The optimal conditions of the reaction to obtain the spherical flower-like MoS2 were at 240 ℃， and the pH value is 0.6. Besides， with an excess of KSCN， the size of the MoS2 became smaller and the intervals between the surface sheets also increased. After adding the CTAB， the morphologies of the products became more structured and their sizes became more uniform.